JP2002300626A - Transmission line by-pass method, subscriber's line accommodation apparatus, and relay transmission line accommodation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission line by-pass method for forming an inexpensive by-pass transmission line without providing any spare relay transmission lines, and for inhibiting band differentials among subscribers, and to provide a subscriber's line accommodation apparatus and a relay transmission line accommodation apparatus. SOLUTION: The transmission line by-pass method includes a step for selecting a specific relay transmission line 12a to be bypassed out of relay transmission lines 12a and 12b, a step for connecting the subscriber's line accommodation apparatus 10b connected to the subscriber's line accommodation apparatus 10a and the relay transmission line 12b that are connected to the specific relay transmission line 12a by the by-pass transmission line 13, and a step for transmitting and receiving first data to be transmitted and received between the subscriber's line accommodation apparatus 10a and the relay transmission line accommodation apparatus via the subscriber's line accommodation apparatus 10b and the relay transmission line 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for bypassing a transmission line,
The present invention relates to a subscriber line accommodation device and a relay transmission line accommodation device, and more particularly to a transmission line detour method used in a digital transmission system, a subscriber line accommodation device, and a relay transmission line accommodation device.

[0002]

2. Description of the Related Art Recently, xDSL has been used as a digital transmission system using an existing telephone copper cable (subscriber line).
(X Digital Subscriber Line) is attracting attention. x
DSL is a technology that provides a high-speed access line to a subscriber by using a high frequency band of several MHz.

In this xDSL, the distance of the telephone copper cable and the frequency band are in inverse proportion. Therefore,
In order to provide a high-speed xDSL line, a network configuration that shortens a telephone copper cable is required. For example, there is a network configuration as shown in FIG. 1 in which a remote xDSL subscriber line accommodating device is provided near a subscriber's house to shorten a telephone copper cable.

FIG. 1 shows an example network configuration including a remote xDSL subscriber line accommodating apparatus. Remote xD of FIG.
The SL subscriber line accommodating apparatus 100 accommodates, for example, one or more xDSL modems installed in a subscriber's house connected by an xDSL line. Further, the accommodating station 110 connects one or more remote xDSL subscriber line accommodating apparatuses 100 to the relay transmission line 12.
0 is connected and accommodated. The remote xDSL subscriber line accommodating apparatus 100 and the accommodation station 110 connect the relay transmission line 1 in preparation for a failure or congestion in the relay transmission line 120.
In many cases, the connection is made via a bypass transmission line 130 having a transmission band equivalent to that of the relay transmission line 120 other than the transmission line 20.

[0005] The detour transmission line 130 is disclosed in, for example,
It is conceivable to use a circuit switching network such as INS (registered trademark) described in JP-A-262338 or JP-A-5-75736. It is also conceivable that the INS line in the above-mentioned publication is regarded as an xDSL line and an xDSL line is used as the bypass transmission line 130. Furthermore, it is conceivable to use a wireless line described in Japanese Patent Application Laid-Open No. 2000-124910 as the bypass transmission line 130.

[0006]

However, when a circuit switching network such as INS described in JP-A-61-262338 or JP-A-5-75736 is used for the bypass transmission line 130, the maximum Transmission speed is 64kb
ps, which makes it impossible to secure the xDSL service transmission speed. XDS on INS line
In order to secure the L service transmission rate, it is necessary to terminate a large number of INS lines to form a multi-link, and there is a problem that the cost increases. Also, the relay transmission line 120
When the transmission line type is different from the detour transmission line 130, there is a problem that the remote xDSL subscriber line accommodating device 100 and the accommodating station 110 require gateway devices.

[0007] The INS line in the above publication is referred to as xDSL.
When an xDSL line is used as the detour transmission line 130, the distance of the detour transmission line 130 is longer than the distance of the xDSL line (subscriber line). Therefore, compared to the transmission speed of the xDSL line, the bypass transmission line 13
However, there is a problem in that the transmission speed of 0 becomes low and the service transmission speed of xDSL cannot be secured. It is to be noted that a plurality of xDSL lines are converted into a multilink to form an xDSL.
In order to secure the service transmission speed, very complicated control is required, and there is a problem that the device cost increases.

Further, when a wireless line described in Japanese Patent Application Laid-Open No. 2000-124910 is used as a bypass transmission line 130, a remote xDSL subscriber line accommodating apparatus 100 is used.
In addition, it is necessary to provide the accommodating station 110 with two different types of interfaces, and there is a problem that the device cost increases.

As described above, the remote xDSL subscriber line accommodating apparatus 100 and the accommodation station 110 are provided with the bypass transmission path 130 so as to continue the service even if the relay transmission path 120 fails or becomes congested. It is necessary, but there is a problem that operation costs increase.

On the other hand, the remote xDSL subscriber line accommodation device 10
0 indicates that it is necessary to shorten the telephone copper cable in order to provide a high-speed xDSL line, and the number of subscribers that can be accommodated by one remote xDSL subscriber line accommodating device 100 decreases.
That is, the cost per subscriber accommodated in one remote xDSL subscriber line accommodation device 100 increases.

In addition, the provision of the detour transmission line 130 for each remote xDSL subscriber line accommodating apparatus 100 raises the operating cost and makes it difficult to provide services at the same price as other high-speed digital transmission systems. Become.

Further, since the number of subscribers accommodated in one remote xDSL subscriber line accommodating apparatus 100 is limited to the same area (for example, the same building, the same apartment, etc.), the number of subscribers accommodated in each area is limited. Is biased.

Therefore, there is a problem that the difference in usable bandwidth between remote xDSL subscriber line accommodating apparatus 100 accommodating a large number of subscribers and remote xDSL subscriber line accommodating apparatus 100 accommodating a small number of subscribers increases. was there.

The present invention has been made in view of the above points, and can form a detour transmission path without providing a spare relay transmission path, and can form a low-cost detour transmission path. It is an object of the present invention to provide a transmission line detour method, a subscriber line accommodating device, and a relay transmission line accommodating device capable of suppressing a band difference between users.

[0015]

In order to solve the above problems, the present invention provides a subscriber line accommodating device accommodating one or more subscriber lines and one or more subscriber line accommodating devices. The relay transmission line accommodating device to be accommodated is connected via a relay transmission line, and in the transmission line detour method of detouring a predetermined relay transmission line among the relay transmission lines, a predetermined detour among the relay transmission lines is performed. A selecting step of selecting a relay transmission path;
A first subscriber line accommodating device connected to the selected predetermined relay transmission line and a second subscriber line accommodating device connected to a relay transmission line other than the predetermined relay transmission line are connected by a detour transmission line. Connecting, and relaying first data to be transmitted / received between the first subscriber line accommodating apparatus and the relay transmission path accommodating apparatus to a relay other than the second subscriber line accommodating apparatus and a predetermined relay transmission path. Transmitting and receiving via a transmission path.

As described above, in the transmission line detour method of the present invention, when a predetermined relay transmission line to be bypassed is selected, the first subscriber line accommodating device connected to the predetermined relay transmission line and the predetermined relay transmission line The second subscriber line accommodating device connected to a transmission line other than the above is connected by a detour transmission line.

Then, the first data to be transmitted and received between the first subscriber line accommodating device and the relay transmission line accommodating device is transmitted to a relay transmission line other than the second subscriber line accommodating device and the predetermined relay transmission line. By transmitting and receiving via the relay transmission line, the relay transmission line can be prevented from being disconnected for a long time, the congestion state of each relay transmission line can be equalized, and the band difference between subscribers can be suppressed. is there.

In addition, since a bypass transmission path can be formed without providing a spare relay transmission path, operation costs can be reduced, and low-cost services can be provided.

Further, since a detour transmission line having a transmission band equivalent to that of a predetermined relay transmission line can be formed, a decrease in service can be minimized even during detour, and service reliability can be reduced. It is possible to secure.

[0020]

Next, embodiments of the present invention will be described with reference to the drawings. In this embodiment, an example in which xDSL is used as an example of a digital transmission system will be described, but any digital transmission system may be used.

First, the principle of the present invention will be described with reference to FIG. FIG. 2 is a diagram illustrating an example for explaining the principle of the transmission line bypass method according to the present invention. In FIG. 2, remote xD
The SL subscriber line accommodating apparatuses 10a and 10b accommodate, for example, one or more xDSL modems installed in subscriber premises by connecting them via xDSL lines 14a and 14b. In addition, the accommodation station 11 includes remote xDSL subscriber line accommodation devices 10a and 10a.
b is connected and accommodated by the relay transmission lines 12a and 12b.

The remote xDSL subscriber line accommodating device 10a and the remote xDSL subscriber line accommodating device 10b are provided with one or more xDSL subscriber line accommodating devices.
They are connected by a detour transmission line 13 formed using a DSL line. The remote xDSL subscriber line accommodating device 10
a and the remote xDSL subscriber line accommodating apparatus 10b are installed within a distance (for example, within several km) within which a band necessary for the bypass transmission path 13 can be secured.

The detour transmission line 13 is used when the remote transmission line 12a or the relay transmission line 12b fails or becomes congested when the remote xDSL subscriber line accommodating device 10a or the remote xD
The SL subscriber line accommodating device 10b is connected to the accommodating station 1 by the relay transmission line 12a or the relay transmission line 12b in which no failure or congestion occurs.
Used to connect to 1. For example, the relay transmission line 12b
If a failure or congestion (hereinafter, referred to as abnormal) occurs in the remote xDSL subscriber line accommodating apparatus 10b, the remote transmission line 13
Remote xDSL subscriber line accommodating apparatus 10a and relay transmission line 1
It is connected to the accommodation station 11 at 2a.

When the xDSL line is used as the detour transmission line 13, the interface required for the detour transmission line 13 is equivalent in circuit to the interface accommodating the subscriber line. This is realized by changing the signal processing firmware. Therefore, the remote xDSL subscriber line accommodation devices 10a and 10b
The xDSL line can be used as the bypass transmission line 13 by making minor changes in hardware and signal processing firmware.

By using the xDSL line having the symmetrical uplink / downlink transmission speed among the xDSL lines, it is not necessary to change the setting of the detour transmission line 13 on the center side / remote side when the relay transmission lines 12a and 12b are abnormal. Thus, the switching time due to the setting change can be reduced.

The detour transmission line 13 is connected to the relay transmission lines 12a, 1
2b, remote xDSL subscriber line accommodating device 10a,
Used for control information transfer between 10b. Therefore, the remote xDSL subscriber line accommodating apparatuses 10a and 10b notify each other of abnormality information of the relay transmission lines 12a and 12b and control information such as a switching request, thereby performing a transmission line detour process when the relay transmission lines 12a and 12b are abnormal. Can be performed independently.

The remote xDSL subscriber line accommodating apparatuses 10a and 10b mutually connected by the bypass transmission path 13
When a control path using, for example, the relay transmission lines 12a and 12b is set between the DSL subscriber line accommodation devices 10a and 10b and the accommodation station 11 that accommodates the DSL subscriber line accommodation devices 10a and 10b, when the relay transmission lines 12a and 12b are abnormal, XD transmission line detour processing
This can be performed independently by the SL subscriber line accommodating apparatuses 10a and 10b and the accommodation station 11.

In the case of using an xDSL line having an asymmetrical uplink / downstream transmission speed among the xDSL lines, the relay transmission line 1
2a, 12b at the center side of the detour transmission line 13 /
The setting on the remote side needs to be changed. In this case, remote x
The DSL subscriber line accommodating devices 10a and 10b
By notifying abnormal information of 2a and 12b and control information such as a switching request, the bypass transmission line 13 is disconnected and the setting of the center side / remote side of the bypass transmission line 13 is changed. As described above, it is possible to change the setting of the center side / remote side of the bypass transmission line 13 in accordance with the direction in which a wide band is required, and it is possible to secure a necessary band in the bypass transmission line 13.

If the setting of the center / remote side of the bypass transmission line 13 cannot be changed during operation, two xDSL lines are used as the bypass transmission line 13 and one of the xDSL lines is used.
By preliminarily setting the L line on the center side and the other xDSL line on the remote side, it is possible to simulate the same band in both directions.

Next, the remote xDSL subscriber line accommodating device 10
The configurations of a and 10b will be described with reference to FIG.
FIG. 3 shows a block diagram of one embodiment of a remote xDSL subscriber line accommodating apparatus. The remote xDSL subscriber line accommodating apparatus 10 of FIG. 3 is configured to include a user line termination unit 20, a multiplexing / demultiplexing unit 22, a switching control unit 23, an xDSL line termination unit 24, and a relay transmission line termination unit 25.

The user line terminating unit 20 includes one or more xDSs.
It includes L line terminators 21a to 21n, and the xDSL line terminators 21a to 21n terminate xDSL lines as user lines. Also, xDSL line terminating units 21a-
21n is connected to the multiplexing / demultiplexing unit 22.

The xDSL line terminating unit 24 is connected to the xDSL line terminating unit 2 of the adjacent remote xDSL subscriber line accommodating apparatus 10.
4 via an xDSL line 26,
The DSL line 26 is terminated. This xDSL line 26
Are used as the bypass transmission path 13. The xDSL line terminating unit 24 is connected to the multiplexing / demultiplexing unit 22.

The relay transmission line terminating unit 25 is connected to an access system accommodating device installed in the accommodation station 11 via a relay transmission line 27, and terminates the relay transmission line 27.
The relay transmission path terminating unit 25 is connected to the multiplexing / demultiplexing unit 22.

The switching control unit 23 receives various switching requests supplied from inside or outside the remote xDSL subscriber line accommodating apparatus 10, and instructs the multiplexing / demultiplexing unit 22 to switch according to the switching request. The multiplexing / demultiplexing unit 22 performs a routing process among the user line terminating unit 20, the xDSL line terminating unit 24, and the relay transmission line terminating unit 25 according to a switching instruction from the switching control unit 23.

For example, when an abnormality occurs in the relay transmission line 27 or when a specific user line is transferred to another remote xDSL subscriber line accommodating apparatus 10, a switching request is made inside or outside the remote xDSL subscriber line accommodating apparatus 10. Is generated, and the switching request is supplied to the switching control unit 23. Note that the switching request is sent to, for example, an operation system provided outside the remote xDSL subscriber line accommodating apparatus 10 or a remote xDSL.
It is generated by a control device provided inside the subscriber line accommodation device 10. The control device provided inside the remote xDSL subscriber line accommodating device 10 is, for example, a relay transmission line termination unit 2.
A switching request is generated using the failure information and congestion information of No. 5.

The multiplexing / demultiplexing unit 22 changes the transfer destination of the data supplied from the user line from the relay transmission line termination unit 25 to the xDSL line termination unit 24 in response to the switching request supplied from the switching control unit 23. , The destination of the data supplied from the xDSL line 26 is changed to the user line terminating unit 20. Therefore, the remote xDSL subscriber line accommodating apparatus 10 can use the xDSL circuit 26 as a bypass transmission path when an abnormality occurs in the relay transmission path 27.

A system including the remote xDSL subscriber line accommodating apparatus 10 as described above will be described with reference to FIG. FIG. 4 is a block diagram showing an embodiment of a system including the xDSL subscriber line accommodating apparatus of the present invention.

The remote xDSL subscriber line accommodating apparatus 10a
It is configured to include xDSL line termination units 31a to 31n, 32, a path selection unit 33, a control unit 34, and a transmission line IF unit 35. Remote xDSL subscriber line accommodation device 10b
Is configured to include xDSL line termination units 41a to 41n and 42, a path selection unit 43, a control unit 44, and a transmission line IF unit 45. In addition, the access system accommodation device 11
Are transmission path IF sections 37a and 37b and a path selection section 38
, A control unit 39, and a backbone relay IF unit 50.

In FIG. 4, the route selection units 33 and 43 correspond to the multiplexing / demultiplexing unit 22 in FIG. 3, the control units 34 and 44 correspond to the switching control unit 23 in FIG. 45
Correspond to the relay transmission line termination unit 25 in FIG.

Remote xDSL subscriber line accommodating device 10a, 1
0b can set two types of modes, a master and a slave. A master is set in the remote xDSL subscriber line accommodating apparatus 10a and a slave is set in the remote xDSL subscriber line accommodating apparatus 10b. The xDSL line termination unit 32 of the remote xDSL subscriber line accommodating device 10a set as a master is an ATU-C (ADSL Transceiver Unit at the CDSL).
entral Office) mode. The xDSL line terminating unit 42 of the remote xDSL subscriber line accommodating device 10b set as the slave is configured to transmit the ATU-R (ATU at the RTU).
emote End) mode.

The xDSL line terminating unit 32 and the xDSL line terminating unit 42 are connected via an xDSL line, and the xDSL line is used as the bypass transmission line 13. In FIG. 4, the xDSL line terminator operating in the ATU-C mode is described as ATU-C. Also, ATU-
The xDSL line terminator operating in the R mode is described as ATU-R.

The remote xDSL subscriber line accommodating apparatus 10a is 1
It includes one or more xDSL line terminating units 31a to 31n, and the xDSL line terminating units 31a to 31n accommodate xDSL line terminating units 30a to 30n installed in subscriber premises. One or more xDSL line termination units 31a to 31n
Are connected to the route selection unit 33.

The remote xDSL subscriber line accommodating device 10b is 1
It includes one or more xDSL line termination units 41a to 41n, and the xDSL line termination units 41a to 41n accommodate xDSL line termination units 40a to 40n installed in subscriber premises. One or more xDSL line terminators 41a-41n
Are connected to the route selection unit 43.

The transmission line IF unit 35 of the remote xDSL subscriber line accommodating device 10a is connected to the transmission line I of the access system accommodating device 11.
It is connected to the F section 37a via the relay transmission line 36. The transmission path IF unit 35 is connected to the path selection unit 33. Also, the transmission line IF of the remote xDSL subscriber line accommodation device 10b.
The unit 45 is a transmission line IF unit 37 of the access system accommodation device 11.
b via the relay transmission line 46. The transmission path IF unit 45 is connected to the path selection unit 43.

The control unit 34 of the remote xDSL subscriber line accommodating apparatus 10a receives various switching requests supplied from inside or outside the remote xDSL subscriber line accommodating apparatus 10a, and in response to the switching request, the route selecting unit 33. Is instructed to switch. The path selection unit 33 includes xDSL line termination units 31a to 31n.
Then, a routing process according to a switching instruction from the control unit 34 is performed between the xDSL line termination unit 32 and the transmission line IF unit 35.

The control unit 44 of the remote xDSL subscriber line accommodating apparatus 10b receives various switching requests supplied from inside or outside the remote xDSL subscriber line accommodating apparatus 10b, and according to the switching request, the route selecting unit 43. Is instructed to switch. The route selection unit 43 includes xDSL line termination units 41a to 41n.
Then, a routing process according to the switching instruction from the control unit 44 is performed between the xDSL line termination unit 42 and the transmission line IF unit 45.

Transmission line IF unit 3 of access system accommodation device 11
7a and 37b are connected to the route selection unit 38. The backbone relay IF unit 50 is connected to the route selection unit 38. The control unit 39 of the access system accommodation device 11
Various switching requests supplied from inside or outside of the access system accommodating device 11 are received, and a switching instruction is issued to the route selecting unit 38 in response to the switching request. The route selection unit 38 selects the transmission path I
A routing process according to a switching instruction from the control unit 39 is performed among the F unit 37a, the transmission line IF unit 37b, and the backbone relay IF unit 50.

The remote xDSL subscriber line accommodating device 10
a control unit 34 and remote xDSL subscriber line accommodating apparatus 10b
A control path using the bypass transmission line 13 is set between the control unit 44 and the control unit 44. The control unit 34 of the remote xDSL subscriber line accommodating device 10a and the control unit 44 of the remote xDSL subscriber line accommodating device 10b, and the access system accommodating device 1
A control path using the relay transmission lines 36 and 46 is set between the control path 39 and the first control section 39.

FIG. 5 shows a sequence diagram of one embodiment of the transmission line bypass procedure. The sequence diagram of FIG. 5 is an example in the case where a failure occurs in the relay transmission line 36. Normally, route information A, B, and C for performing a routing process are set in the route selection units 33, 43, and 38, respectively. For example, data supplied from the xDSL line terminating unit 31a to the route selecting unit 33 is transmitted to the transmission line IF unit 3 according to the route information A.
Routed to 5.

When a failure occurs in the relay transmission line 36, the transmission line IF unit 35
And notifies the control unit 34 of transmission line failure information. Following step S1, step S2
The control unit 34 notifies the control unit 44 of the remote xDSL subscriber line accommodating apparatus 10b of the transmission path failure information via the control path using the bypass transmission path 13. Specifically, the transmission path failure information is transmitted from the control section 34 to the path selection section 33, xDSL.
The control unit 44 is notified via the line termination unit 32, the xDSL line termination unit 42, and the route selection unit 43.

In step S3 following step S2, the control unit 44 notifies the control unit 39 of the access-system accommodating apparatus 11 of the transmission line failure information via the control path using the relay transmission line 46. Specifically, the transmission line failure information is notified from the control unit 44 to the control unit 39 via the path selection unit 43, the transmission line IF unit 45, the transmission line IF unit 37b, and the path selection unit 38.

As described above, the control unit 34 of the remote xDSL subscriber line accommodating device 10a, the control unit 44 of the remote xDSL subscriber line accommodating device 10b, and the control unit 39 of the access system accommodating device 11 are generated in the relay transmission line 36. Recognize failure.

When an xDSL line having an asymmetrical uplink / downlink transmission speed among the xDSL lines is used, it is necessary to change the setting of the detour transmission line 13 on the center side / remote side. In step S4, the control unit 34 notifies the xDSL line termination unit 32 of an instruction to change the direction of the bypass transmission line 13. In step S5, the control unit 44 notifies the xDSL line termination unit 42 of an instruction to change the direction of the bypass transmission line 13. By the processing of steps S4 and S5, the xDSL line termination unit 32 and the xDSL line termination unit 42 switch the ATU-C mode to the ATU-R mode or the ATU-C mode to the ATU-C mode.
The mode is switched to the TU-R mode. And step S
At 6, the detour transmission line 13 is once disconnected and then reconnected.

In step S7, the control unit 34 changes the route information A set in the route selection unit 33 to A '.
Also, in step S8, the control unit 44
Is changed to B '. Further, in step S9, the controller 39 changes the route information C set in the route selector 38 to C '.

For example, the data supplied from the xDSL line terminating unit 31a to the route selecting unit 33 is, as shown in step S9, the xDSL line terminating unit 32 according to the route information A '.
And is supplied to the route selecting unit 38 via the xDSL line terminating unit 42, the route selecting unit 43, the transmission line IF unit 45, and the transmission line IF unit 37b.

Further, the path selection switching process will be described in detail. For example, the path selecting unit 33 changes the output port of each user data in the uplink direction input from the xDSL line terminating units 31a to 31n from the transmission line IF unit 35 to the xDSL line terminating unit 32. Further, the route selection unit 33
The addresses 1 to n of each user data in the down direction input from the L line terminating unit 32 are changed to xDSL line terminating units 31a to 31n as output ports. As described above, the remote xDSL subscriber line accommodating apparatus 10a can transmit and receive each user data via the bypass transmission path 13.

The route selection unit 43 is an xDSL line termination unit 42
The output port of each user data in the upstream direction input from the remote line is set in the transmission line IF unit 45, and the address 1 to n of each user data of the remote xDSL subscriber line accommodating apparatus 10a is set to the remote xDSL subscriber line accommodating apparatus 10b. Addresses m + 1 to m + 1 do not overlap with addresses 1 to m of each user data.
Change to m + n.

The path selecting section 43 is provided with a transmission path IF section 45.
The xDSL line terminating unit 42 is set as an output port for user data of addresses m + 1 to m + n input from, and addresses m + 1 to m + n of the user data are changed to addresses 1 to n. As described above, remote xDSL
The subscriber line accommodating apparatus 10b can transmit / receive each user data of the remote xDSL subscriber line accommodating apparatus 10a via the bypass transmission path 13 and the relay transmission path 46.

The route selection unit 38 connects the input port of the user data of the remote xDSL subscriber line accommodating apparatus 10a to the transmission path I.
While changing from the F section 37a to the transmission path IF section 37b,
Addresses 1 to n of each user data are replaced with addresses m + 1 to m
+ N. Further, the route selection unit 38 changes the output port of the user data of the addresses 1 to n input from the backbone relay IF unit 50 from the transmission line IF unit 37a to the transmission line IF unit 37b, and changes the address of each user data. 1 to n are changed to addresses m + 1 to m + n. As described above, the access system accommodating apparatus 11 transmits each user data of the remote xDSL subscriber line accommodating apparatus 10a to the relay transmission path 4.
6 can be transmitted and received.

In the sequence diagram of FIG.
5 detects a fault that has occurred in the relay transmission line 36,
The transmission line IF unit 37a may detect a failure that has occurred in the relay transmission line 36. In this case, the control unit 39 controls the relay transmission line 4
6, the control unit 44 of the remote xDSL subscriber line accommodating apparatus 10b is notified of the transmission path failure information via the control path using the communication path 6. Further, the control unit 44 notifies the control unit 34 of the remote xDSL subscriber line accommodating apparatus 10a of the transmission line failure information via the control path using the bypass transmission line 13.

In the sequence diagram of FIG. 5, an example in which a failure occurs in the relay transmission line 36 has been described.
This may be the case when congestion occurs in the relay transmission line 36.
Further, even when a failure or congestion occurs in the relay transmission line 46, the same processing as in the sequence diagram of FIG. 5 can be performed.

The present invention can be configured as described in the following supplementary notes.

(Supplementary Note 1) A subscriber line accommodating device accommodating one or more subscriber lines and a relay transmission line accommodating device accommodating the one or more subscriber line accommodating devices are connected via a relay transmission line. Connected, wherein in the transmission path detour method of detouring a predetermined relay transmission path among the relay transmission paths, a selecting step of selecting a predetermined relay transmission path to detour among the relay transmission paths; and Connected to the relay transmission line of
Connecting the subscriber line accommodating device and a second subscriber line accommodating device connected to a relay transmission line other than the predetermined relay transmission line by a detour transmission line; and the first subscriber line accommodating device. And a transmitting / receiving step of transmitting / receiving first data to be transmitted / received between the relay transmission line accommodation devices via the second subscriber line accommodation device and a relay transmission line other than a predetermined relay transmission line. Transmission line bypass method.

(Supplementary Note 2) The selecting step includes a step of detecting an abnormality in a relay transmission line that connects the one or more subscriber line accommodation devices and the relay transmission line accommodation device, and a step of detecting the abnormality. Selecting the relay transmission path as the predetermined relay transmission path to bypass the transmission path.

(Supplementary Note 3) The selecting step includes the steps of: detecting a congestion degree of a relay transmission line that connects the one or more subscriber line accommodation devices and the relay transmission line accommodation device, respectively; Selecting a relay transmission line having a high degree as the predetermined relay transmission line to be bypassed.

(Supplementary Note 4) The connecting step is characterized in that the first subscriber line accommodating device and the second subscriber line accommodating device are connected via one or more subscriber lines. 1
Transmission path bypass method described.

(Supplementary note 5) The transmission line bypass method according to any one of Supplementary notes 1 to 4, wherein the subscriber line is an xDSL line.

(Supplementary Note 6) In a subscriber line accommodating apparatus accommodating one or more subscriber lines, a connection to a relay transmission line accommodating apparatus accommodating one or more subscriber line accommodating apparatuses is made via a relay transmission line. A relay transmission line connection means, and monitors the state of the connected relay transmission line, and transmits first transmission data to be transmitted to the relay transmission line accommodation device to another subscriber line accommodation device according to the monitoring result. Transfer means for transferring the first reception data to be received from the relay transmission line accommodation device from the other subscriber line accommodation device.

(Supplementary Note 7) When the second transmission data to be transmitted from the other subscriber line accommodation device to the relay transmission line accommodation device is transferred, the transfer means adds the second transmission data to the first transmission data. While transmitting the transferred second transmission data to the relay transmission line accommodating device, the second transmission data to be received by the other subscriber line accommodating device in addition to the first reception data from the relay transmission line accommodating device. 7. The subscriber line accommodation device according to claim 6, wherein when the received data is supplied, the second reception data is transferred to another subscriber line accommodation device.

(Supplementary Note 8) The subscriber line accommodating device according to Supplementary Note 6, wherein the subscriber line accommodating device and another subscriber line accommodating device are connected via one or more subscriber lines. apparatus.

(Supplementary Note 9) The subscriber line accommodation apparatus according to any one of Supplementary Notes 6 to 8, wherein the subscriber line is an xDSL line.

(Supplementary Note 10) In a relay line accommodating apparatus accommodating one or more subscriber line accommodating apparatuses, the relay line accommodating apparatus accommodating one or more subscriber lines is connected via a relay transmission line. A relay transmission line connecting means for monitoring a state of the connected relay transmission line, and transmitting first transmission data to be transmitted to the first subscriber line accommodating device to the second subscriber in accordance with a result of the monitoring; A transmission / reception means for transmitting to the line accommodation device and receiving first reception data to be received from the first subscriber line accommodation device from the second subscriber line accommodation device. Transmission line accommodation device.

(Supplementary Note 11) The relay transmission line accommodating device according to Supplementary Note 10, wherein the relay transmission line connection unit monitors an abnormality or a congestion degree of the connected relay transmission line.

[0074]

As described above, according to the present invention, it is possible to prevent the relay transmission line from being disconnected for a long time, to make the congestion state of each relay transmission line uniform, It is possible to suppress the band difference.

Further, since a detour transmission line can be formed without providing a spare relay transmission line, operation costs can be reduced and low-cost services can be provided.

Further, since a detour transmission line having a transmission band equivalent to a predetermined relay transmission line can be formed, service degradation can be minimized even during detour, and service reliability can be reduced. It is possible to secure.

[0077]

[Brief description of the drawings]

FIG. 1 is an example network configuration diagram including a remote xDSL subscriber line accommodation device.

FIG. 2 is a diagram illustrating an example of a principle of a transmission line bypass method according to the present invention;

FIG. 3 is a block diagram of one embodiment of a remote xDSL subscriber line accommodation apparatus.

FIG. 4 is a configuration diagram of an embodiment of a system including the xDSL subscriber line accommodating apparatus of the present invention.

FIG. 5 is a sequence diagram of one embodiment of a transmission line bypass procedure.

[Explanation of symbols]

10, 10a, 10b Remote xDSL subscriber line accommodation device 11 Accommodation station 12a, 12b Relay transmission line 13 Detour transmission line 14a, 14b xDSL circuit 20 User line termination unit 21a-21n xDSL line termination unit 22 Multiplexing / demultiplexing unit 23 Switching control Parts 24, 30a to 30n, 31a to 31n, 32, 40a
To 40n, 41a to 41n, 42 xDSL line termination unit 25 relay transmission line termination unit 26 xDSL line 27 relay transmission line 33, 43, 38 path selection unit 34, 44, 39 control unit 35, 45, 37a, 37b transmission line IF Unit 50 Backbone relay IF unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Yamamoto, Inventor 2-2-1 Hyakuchihama, Sawara-ku, Fukuoka, Fukuoka Prefecture Inside Fujitsu West Japan Communication Systems Co., Ltd. (72) Inventor Shibagaki Tax Sora-ku, Fukuoka Prefecture 2-2-1 Hyakumichihama F-term in Fujitsu West Japan Communication Systems Co., Ltd. (Reference) 5K014 AA04 CA01 FA01 5K035 AA03 BB03 CC05 DD01 FF02 5K049 AA07 BB09 FF43 FF55 5K051 AA01 BB02 DD02 FF02 FF17 LL02 LL07

Claims (5)

[Claims] 1. A subscriber line accommodating device accommodating one or more subscriber lines, and a relay transmission line accommodating device accommodating the one or more subscriber line accommodating devices are connected via a relay transmission line. A transmission line bypassing method for bypassing a predetermined relay transmission line among the relay transmission lines, wherein a selecting step of selecting a predetermined relay transmission line to bypass the relay transmission line; and A connection step of connecting a first subscriber line accommodation device connected to a transmission line and a second subscriber line accommodation device connected to a relay transmission line other than the predetermined relay transmission line by a detour transmission line; First data to be transmitted and received between the first subscriber line accommodation device and the relay transmission line accommodation device is transmitted and received via a relay transmission line other than the second subscriber line accommodation device and a predetermined relay transmission line. Transmitting and receiving steps. Route detour method. 2. A subscriber line accommodating device accommodating one or more subscriber lines, wherein the relay transmission is connected to a relay transmission line accommodating device accommodating the one or more subscriber line accommodating devices via a relay transmission line. Path connection means, for monitoring a state of the connected relay transmission path, and transferring first transmission data to be transmitted to the relay transmission path accommodation apparatus to another subscriber line accommodation apparatus according to the monitoring result. Transfer means for transferring the first reception data to be received from the relay transmission line accommodation device from the other subscriber line accommodation device. 3. When the second transmission data to be transmitted from the another subscriber line accommodation device to the relay transmission line accommodation device is transferred, the transfer means adds the first transmission data to the transfer data. While transmitting the second transmission data to the relay transmission line accommodating device, while receiving the second reception data from the relay transmission line accommodating device in addition to the first reception data by the other subscriber line accommodation device. 3. The subscriber line accommodation device according to claim 2, wherein when the data is supplied, the second received data is transferred to another subscriber line accommodation device. 4. A relay transmission line accommodating device accommodating one or more subscriber line accommodating devices, wherein the relay transmission is connected to the subscriber line accommodating device accommodating the one or more subscriber line via a relay transmission line. Path connection means, and monitors the status of the connected relay transmission line, and, based on the result of the monitoring, transmits first transmission data to be transmitted to the first subscriber line accommodation device to the second subscriber line accommodation device. Transmitting / receiving means for receiving from the second subscriber line accommodating device first reception data to be received from the first subscriber line accommodating device while transmitting to the device. Housing equipment. 5. The relay transmission line accommodating apparatus according to claim 4, wherein said relay transmission line connection means monitors an abnormality or a congestion degree of said connected relay transmission line.